That's what the "Art of the Deal" is. It works like this:
- Trump notices something that tickles his fancy (for some idiotic reason).
- he goes and mess with it.
- he threatens to mess with it some more unless the other party vaguely agrees with him.
- the situation is now worse than it used to be
- everyone hates Trump, the US is seen as more unreliable than it used to be.
- Great Success! Let's build an arch in Washington to celebrate!